I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
cover caver coffer covary cougher coiffeur gofer quaver quiver goffer gopher caviar caviare goofier quavery quivery coiffure
hoover mover lover hover shover rover over cover weaver jiver waiver siver saver knavery liver beaver newwaver riever vier whoever wavery sever never quavery very laver shivery shaver wiver reaver gofer quivery aiver roofer heavier ever revere river revery reiver caver livery suaver diver jivier severe wavier livier louver veer liever paver bouvier naiver savvier soever waver heaver weever lever raver levier aver leavier fever giver leaver every quaver laveer haver fiver quiver vera woofer shiver hoofer